1.1 本试验方法包括通过直流氩等离子体原子发射光谱法（DCP-AES）测定盐水、海水和微咸水中的溶解钡和总可回收钡。 1.2 本试验方法在10 mg/L至20 mg/L范围内进行试验。应稀释样品，使其浓度在校准范围内（见 11.1 和 12.5 ). 更高的浓度也可以通过更改为不太敏感的排放线来确定。 1.3 以国际单位制表示的数值应视为标准值。本标准不包括其他计量单位。 1.4 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前制定适当的安全和健康实践，并确定监管限制的适用性。 1.5 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认标准化原则制定的。 ====意义和用途====== 5.1 所有含有酸溶性钡化合物的水都是有毒的。本试验方法适用于测定盐水、海水和微咸水中的钡。 5.2 摄入、吸入或吸收500至600毫克钡被认为对人类是致命的。低水平可能导致心脏、血管和神经的紊乱。饮用水标准将钡的最大污染水平设定为2毫克/升钡。

1.1 This test method covers the determination of dissolved and total recoverable barium in brines, seawater, and brackish waters by direct-current argon plasma atomic emission spectroscopy (DCP–AES). 1.2 This test method has been tested in the range from 10 mg/L to 20 mg/L. Samples shall be diluted to contain concentrations within the calibration range (see 11.1 and 12.5 ). Higher concentrations can also be determined by changing to a less sensitive emission line. 1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. 1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 5.1 All waters containing acid soluble barium compounds are known to be toxic. This test method is useful for the determination of barium in brines, seawater, and brackish waters. 5.2 Consumption, inhalation, or absorption of 500 to 600 mg of barium is considered fatal to human beings. Lower levels may result in disorders of the heart, blood vessels, and nerves. The drinking water standards set the maximum contaminant level for barium as 2 mg/L barium.